5 Weight Loss Mistakes To Avoid - Part 2

 
Weight loss mistake #2 - Over-reporting the "extra" calorie expenditure of your exercise routine

Most people prefer to count the calories they burn while exercising as "extra" calories, but there is a difference between calories burned while exercising and "extra" calories burned while exercising!

Consider this example: you burn 300 calories by walking on the treadmill instead of your usual activity (watching TV). in reality, you need to subtract the calories you would have spent watching TV from these 300 calories in order to calculate how many additional calories you have burned.

Let's say that if you watched TV you burned 80 calories. In this specific case, you have expended 300 calories while exercising, along with 220 "extra" calories. 

Calorie counters often add the calories burned exercising as "extra", and in some cases this practice can significantly influence the calorie calculations. Thus, calorie software usually counts the part of your usual activities that overlaps with the extra activities twice. 

How do you estimate the "extra" calories burned while exercising? 

In order to increase the accuracy of the calculations, I must first introduce the concept of MET values. MET values are a convenient way to calculate the calorie expenditure of activities.

MET values are multiples of one's resting energy expenditure per time period. In plain English, MET = 3 means burning 3 times more calories than resting. MET = 1 denotes the number of calories you burn at rest (your Resting Metabolic Rate or Basal Metabolic Rate).

No matter what you do, you burn calories at a rate of at least MET = 1, except for sleeping which has MET = 0.9. During the day, most activities include sitting and walking which have MET values between 1.2 and 3. Your total daily energy expenditure is calculated simply by multiplying your Resting Metabolic Rate by the average MET of all your activities. Is your head spinning yet? 

Let's look at a real world example: Consider a female person with a Resting Metabolic Rate of 1200 calories per day. One day consists of 1440 minutes. Our example lady is burning 1200/1440 = 0.84 calories per minute at rest, which signifies a MET = 1.

Let's say our example lady just returned from an aerobics class, where she exercised for 30 minutes. General aerobic class training has a MET = 6, do our example lady has just burned 30 (minutes) x 6 (MET) * 0.84 (calories per minute) = 151 calories while exercising.

Now suppose this woman would have chatted on the internet instead of exercising (MET = 1.5). In this example, the woman substituted chatting on the internet with aerobic exercising. Keep in mind that every time you do something you substitute one activity for another, so in order to get the extra calories, we have to subtract 1.5 (chatting) from 6 (exercising). Now let's calculate the extra calories: 30 (minutes) * (6 - 1.5) (MET value) * 0.84 = 113 calories. 

Let's discuss what a standard calorie counter would have done in this example: First, it will assume an average calorie burn rate of 1 calorie per minute. Then the counter will find that exercising for 30 minutes will yield 30 (minutes) * 6 (MET) * 1 (calories per minute) = 180 calories. The calorie counter will add these 180 calories to your daily calorie expenditure without considering that a part of these 180 calories is already accounted for by your regular activities. 

Now do you see the difference between 113 calories and 180 calories? If that same lady spends 5 hours per week in the aerobics class, the standard calorie counters will over-report her calorie expenditure by: (180-113) * 10 = 670 calories a week.

She will thus be fooled into thinking that her metabolic rate has dropped while she just overestimated her calorie expenditure. Enter a typical weight loss plateau, wasted time, and effort. Do you have time to spend on trial and error calorie estimations? 

Always remember these two rules:

1. Only report your extra activities to your calorie counter. If you walk to the office each day, don't log "walking to office for 30 minutes" as an extra activity. You must consider only unusual activities that actually contribute to expending extra calories!
    
2. Always subtract the calories that you would have burned instead of exercising. As a general rule, you should subtract from 1.2 to 1.5 from the MET values.
   
   In some cases, you'll need to subtract a higher MET. If you substitute 30 minutes of bodybuilding (MET = 6) for 30 minutes of slow rope jumping (MET = 8) then the additional MET would be 8 - 6 = 2.

About the author:

Hristo Hristov is the owner of X3MSoftware, a company specializing in developing training and nutrition software. He has a Computer Science degree and a passion for powerlifting.

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